Cover plate assembly and battery

Abstract

The invention relates to the technical field of batteries, and provides a cover plate assembly and a battery, the cover plate assembly comprises a cover plate body, a pole and a fixing structure, the pole is arranged on the cover plate body; the fixing structure is fixed on the cover plate body, the fixing structure comprises a plurality of folded edges, the plurality of folded edges are arranged around the same pole at intervals, and the folded edges are used for fixing the pole; wherein the folded edges comprise outer edges far away from the pole, the maximum distance between the outer edges of different folded edges is D, the maximum width of the cover plate body is L, D / L is 0.7-2, and the size of the pole in the length direction of the cover plate body is larger than that of the pole in the width direction of the cover plate body. The open-current area of the pole can be increased under the limited width of the cover plate body, and the heat dissipation effect of the pole is improved.

Description

[0001] This application is a divisional application of the invention application with the application date of June 20, 2024, the Chinese application number 202410798447.1, and the invention name “Cover assembly, its manufacturing method, and battery”. Technical Field

[0002] The present invention relates to the technical field of batteries, and in particular to a cover plate assembly and a battery. Background Art

[0003] In the related art, the cover assembly includes a cover body and a pole, and the pole is arranged on the cover body. However, the width of the cover body is limited, and it is difficult for the pole to have a large cross-sectional area, resulting in low current flow capacity and heat dissipation efficiency of the pole.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The invention provides a cover plate assembly, which can improve the technical problems of low current carrying capacity and heat dissipation efficiency of a pole.

[0006] The cover assembly includes:

[0007] Cover plate body;

[0008] A pole, which is arranged on the cover body;

[0009] A fixing structure is fixed on the cover body, the fixing structure comprises a plurality of folded edges, the plurality of folded edges are arranged at intervals around the same pole, and the folded edges are used to fix the pole;

[0010] Among them, the folded edge includes an outer edge away from the pole, the maximum distance between the outer edges of different folded edges is D, the maximum width of the cover body is L, wherein D / L is 0.7-2, and the size of the pole in the length direction of the cover body is greater than the size of the pole in the width direction of the cover body.

[0011] The present invention sets the folding interval for fixing the pole, and the maximum distance D between the outer edges of different folding edges will not be limited by the width of the cover body. This setting can increase the maximum distance D between the outer edges of different folding edges, so that the pole fixed by the folding edge can also have a larger size in the length direction of the cover body. The pole with a larger size can have a larger current capacity and heat dissipation speed.

[0012] The present invention also provides a method for manufacturing a cover plate assembly, the manufacturing method comprising:

[0013] Provided is a semi-finished cover plate product, the semi-finished cover plate product comprising a cover plate body, a plurality of vertical walls, and a pole, wherein the pole is arranged on the cover plate body, and a plurality of the vertical walls are fixed on the cover plate body and are arranged at intervals around the pole;

[0014] The roller assembly is used to make a circular motion so that the roller of the roller assembly presses and bends the vertical wall toward one side of the pole, and the bent vertical wall forms a folded edge, and the folded edge is used to fix the pole on the cover plate body;

[0015] The roller is in contact with the vertical wall at an angle, and the roller gradually moves toward the central axis of the pole.

[0016] The manufacturing method of the cover plate assembly provided by the present invention utilizes a roller assembly to perform circular motion. The roller assembly performing circular motion is easy to implement and has a simple structure. In addition, the manufacturing method can also realize rapid forming of folding edges.

[0017] The present invention also provides a method for manufacturing a cover plate assembly, the manufacturing method comprising:

[0018] Provided is a semi-finished cover plate product, the semi-finished cover plate product comprising a cover plate body, a plurality of vertical walls, and a pole, wherein the pole is arranged on the cover plate body, and a plurality of the vertical walls are fixed on the cover plate body and are arranged at intervals around the pole;

[0019] A plurality of roller assemblies are used to bend the vertical walls corresponding to the poles respectively toward one side thereof, the vertical walls and the roller assemblies are arranged in one-to-one correspondence, the bent vertical walls form folded edges, and the folded edges are used to fix the poles on the cover plate body;

[0020] Wherein, using a plurality of roller assemblies to bend the vertical walls corresponding to the poles toward one side thereof respectively comprises:

[0021] Utilize the plurality of roller assemblies to perform reciprocating motion, so that the rollers of the roller assemblies press and bend the vertical wall corresponding to the pole toward one side;

[0022] The roller is in contact with the vertical wall at an angle, and the roller gradually moves toward the central axis of the pole.

[0023] The cover plate assembly manufacturing method provided by the present invention utilizes a roller assembly to perform reciprocating motion. On the one hand, the roller will not rotate to the gap between the vertical walls, thereby causing the roller rotation to be obstructed; on the other hand, the roller only generates pressure on the vertical wall corresponding to it, and the folding edge forming efficiency is relatively high.

[0024] The present invention also provides a battery, comprising the above-mentioned cover plate assembly, wherein the pole in the battery has a higher current flow capacity and heat dissipation speed.

[0025] The present invention also provides a battery device, which includes the battery mentioned above.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0028] in:

[0029] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a cover plate assembly of the present disclosure.

[0030] Figure 2 for Figure 1 A partial enlarged view of area A in the cover assembly is shown.

[0031] Figure 3 for Figure 2 Top view of the cover assembly.

[0032] Figure 4 for Figure 2 Exploded view of the cover assembly shown.

[0033] Figure 5 for Figure 2 The cover plate assembly is shown in cross-section along the dashed line BB.

[0034] Figure 6 for Figure 5 A side view of the cover plate assembly is shown.

[0035] Figure 7 It is a structural schematic diagram of another exemplary embodiment of the cover plate assembly disclosed in the present invention.

[0036] Figure 8 It is a schematic structural diagram of an exemplary embodiment of a battery disclosed in the present invention.

[0037] Fig. 9 It is a partial structural schematic diagram of another exemplary embodiment of the cover plate assembly disclosed in the present invention.

[0038] Description of reference numerals:

[0039] 1. Cover plate body; 2. Pole; 21. Main body; 211. First main body; 212. Second main body; 22. Annular raised portion; 3. Fixing structure; 31. Folding edge; 311. First folding edge; 312. Second folding edge; 3131. First end portion; 3132. Second end portion; 314. Thinning area; 32. Arc-shaped connecting portion; 4. Limiting portion; 41. Pole hole; 5. Cell body; 61. Insulating member; 611. Arc-shaped extension portion; 612. Straight extension portion; 62. Sealing member; 7. Main shell; 613. Raised portion. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0041] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0042] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0043] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0044] like Figure 1-6 As shown, Figure 1This is a structural schematic diagram of an exemplary embodiment of a cover plate assembly disclosed herein. Figure 2 for Figure 1 A partial enlarged view of area A in the cover assembly shown, Figure 3 for Figure 2 Top view of the cover assembly, Figure 4 for Figure 2 An exploded view of the cover assembly is shown. Figure 5 for Figure 2 The cross-sectional view of the cover assembly along the dotted line BB is shown. Figure 6 for Figure 5 A side view of the cover plate assembly is shown.

[0045] The cover assembly includes: a cover body 1, a pole 2, and a fixing structure 3, wherein the pole 2 is arranged on the cover body 1; the fixing structure 3 is fixed on the cover body, and the fixing structure 3 includes a plurality of folded edges 31, wherein the plurality of folded edges 31 are arranged at intervals around the same pole 2, and the folded edges 31 are used to fix the pole 2; wherein the folded edges 31 include an outer edge 313 away from the pole 2, the maximum distance between the outer edges 313 of different folded edges is D, the maximum width of the cover body 1 is L, wherein D / L is 0.7-2.

[0046] This exemplary embodiment sets the folding spacing for fixing the poles, and the maximum distance D between the outer edges of different folding edges will not be limited by the width of the cover body. This setting can increase the maximum distance D between the outer edges of different folding edges, so that the poles fixed by the folding edges can also have a larger size in the length direction of the cover body. The poles with larger sizes can have a larger current capacity and heat dissipation speed.

[0047] In this exemplary embodiment, the battery includes a main housing, the main housing is formed with an opening, the battery cell is assembled into the main housing through the opening, and the cover body 1 is used to buckle the opening. The pole 2 is used to form an electrode output end of the battery. The cover body 1 can be located at the top of the battery or at other locations such as the bottom of the battery.

[0048] In this exemplary embodiment, Figure 1-6 As shown, the size of the pole 2 in the length direction X of the cover body 1 can be greater than the size of the pole 2 in the width direction Y of the cover body 1. In this exemplary embodiment, the cross section of the pole 2 perpendicular to its axial direction Z is a runway shape. It should be understood that in other exemplary embodiments, the cross section of the pole perpendicular to its axial direction Z can also be other shapes, for example, the cross section of the pole perpendicular to its axial direction Z can be rectangular, elliptical, polygonal, irregular, etc. In this exemplary embodiment, the axial direction Z of the pole is perpendicular to the cover body 1.

[0049] In this exemplary embodiment, Figure 1-6As shown, the pole 2 can be arranged symmetrically along its central axis, that is, after the pole 2 is rotated 180° along its central axis, the pole coincides with the previous position. This arrangement can greatly improve the space utilization on the cover body while increasing the size of the pole 2.

[0050] In this exemplary embodiment, D / L can be equal to 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc. The larger the D / L, the larger the maximum distance D between the outer edges of different folded edges, and the larger the size of the pole fixed by the folded edge 31 in the length direction of the cover body can be set, and the stronger the current flow capacity and heat dissipation capacity of the pole; at the same time, if D / L is too large, the pole occupies too much space in the length direction of the cover body, which is not conducive to the design of other structures such as explosion-proof valves and injection holes on the cover assembly. In this exemplary embodiment, D / L is set to a suitable size, which can not only ensure that the pole has a strong current flow capacity and heat dissipation capacity, but also facilitate the design of other structures of the cover assembly.

[0051] In this exemplary embodiment, the outer edges 313 of the plurality of folded edges 31 may be located on the circumference of the same circle. It should be understood that in other exemplary embodiments, at least some of the outer edges 313 of the folded edges 31 may also be located on the circumferences of different circles.

[0052] In this exemplary embodiment, Figure 1-6 As shown, the plurality of folded edges 31 may include a first folded edge 311 and a second folded edge 312, the first folded edge 311 and the second folded edge 312 are arranged opposite to each other in the length direction X of the cover body 1, and the maximum distance between the outer edge 313 of the first folded edge 311 and the outer edge 313 of the second folded edge 312 is D, wherein D / L is 0.7-1.7, for example, D / L may be equal to 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, etc. In this exemplary embodiment, the fixing structure 3 includes two folded edges 31, and it should be understood that in other exemplary embodiments, the fixing structure may also include other numbers of folded edges. For example, Figure 7 FIG. 1 is a schematic diagram of the structure of another exemplary embodiment of the cover plate assembly disclosed in the present invention. Figure 7 In the illustrated embodiment, the fixing structure includes six folded edges 31 .

[0053] In this exemplary embodiment, Figure 1-6 As shown, the first folded edge 311 and the second folded edge 312 can be symmetrically arranged parallel to the symmetry axis in the width direction Y of the cover body 1. The symmetrically arranged first folded edge 311 and the second folded edge 312 can have a better fixing effect on the pole.

[0054] It should be noted that when obtaining the maximum distance D between the outer edges of different folded edges, the maximum distances between the outer edges of different folded edges can be measured, and the maximum value among the multiple maximum distances is obtained as the maximum distance between the outer edges of different folded edges. Figure 3 As shown, the maximum distance D between the outer edge 313 of the first folded edge 311 and the outer edge 313 of the second folded edge 312 is the distance between the outer edge 313 of the first folded edge 311 and the outer edge 313 of the second folded edge 312 in the length direction of the cover body 1.

[0055] In this exemplary embodiment, the cover body 1 includes a length direction X and a width direction Y. The size of the cover body 1 in the length direction X is greater than the size in the width direction Y, and at least part of the side of the cover body 1 is parallel to the length direction X, at least part of the side of the cover body 1 is parallel to the width direction Y, the length direction X and the width direction Y are perpendicular, and the side of the cover body parallel to the length direction X and the width direction Y forms the side of the maximum area of ​​the cover body. The length of the cover body is the size of the cover body in the length direction, and the width of the cover body is the size of the cover body in the width direction. For example, the cover body 1 can be a rectangle, a rounded rectangle or other quasi-rectangular shape. When the cover body is a rectangle or a quasi-rectangular shape, the maximum width of the cover body is the size of the cover body in the width direction.

[0056] In addition, the cover body may also be circular. When the cover body is circular, the maximum width of the cover body is the diameter of the circle.

[0057] In this exemplary embodiment, Figure 1-6As shown, the outer edge 313 of the first folded edge 311 includes a first end 3131, and the outer edge 313 of the second folded edge 312 includes a second end 3132 close to the first end 3131; the orthographic projection of the central axis of the pole 2 on the plane where the cover body 1 is located forms the vertex of the first angle α, the orthographic projection of the first end 3131 on the plane where the cover body 1 is located is located on one side of the first angle, and the orthographic projection of the second end 3132 on the plane where the cover body 1 is located is located on the other side of the first angle; the degree of the first angle α is 60°-150°. For example, the degree of the first angle α can be 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc. If the first angle α is too large, the extension length of the fold 31 is too short, or the maximum distance between the outer edge 313 of the first fold 311 and the outer edge 313 of the second fold 312 is too large, the fixing effect of the fold 31 on the pole 2 is poor; if the first angle α is too small, the distance between the first end 3131 and the second end 3132 is too small, and the size of the pole 2 in the length direction X of the cover body 1 is small. In this exemplary embodiment, the first angle α is set to a suitable size, which can greatly increase the size of the pole 2 in the length direction X of the cover body 1 while ensuring the fixing strength of the fold 31 on the pole 2.

[0058] It should be noted that the central axis of the pole 2 is an axis parallel to the axial direction of the pole and located at the centroid of the end face of the pole, and the end face of the pole is perpendicular to the axial direction of the pole.

[0059] In this exemplary embodiment, the cap plate assembly can be applied to a battery. Figure 8 Schematic diagram of the structure of an exemplary embodiment of the battery disclosed in the present invention. The battery may include a battery cell, and the battery cell includes a battery cell body 5 and a tab. It should be noted that the plane where the cover body 1 is located may be the plane where the largest side surface of the cover body 1 on the side away from the battery cell body 5 is located.

[0060] In this exemplary embodiment, Figure 1-6 As shown, the fixing structure 3 may further include: an arc-shaped connecting portion 32 , wherein the arc-shaped connecting portion 32 is connected between the folded edge 31 and the cover body 1 .

[0061] The degree of the first angle is a°, the radius of curvature of the outer edge 313 is bmm, and a / b is 1-30. For example, a / b can be equal to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, etc. If a / b is too large, the degree of the first angle α is too large, the radius of curvature of the outer edge 313 is too small, and accordingly, the size of the pole 2 in the width direction Y of the cover body 1 is too small, and the current flow capacity and heat dissipation capacity of the pole are relatively weak; if a / b is too small, the degree of the first angle α is too small, the radius of curvature of the outer edge 313 is too large, the bending degree of the outer edge 313 is small and the extension length is small, and the fixing effect of the fixing structure 3 on the pole 2 is relatively poor. In this exemplary embodiment, a / b is set to a suitable value, which can not only ensure the fixing effect of the fixing structure 3 on the pole 2, but also improve the current flow capacity and heat dissipation capacity of the pole 2.

[0062] In this exemplary embodiment, b may be 5-60, for example, b may be equal to 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, etc.

[0063] In this exemplary embodiment, Figure 1-6 As shown, the area enclosed by the orthographic projection of the outer edges 313 of the plurality of folded edges 31 on the plane where the cover body 1 is located is 100 mm 2 -1500mm 2 For example, the area enclosed by the orthographic projection of the outer edges 313 of the plurality of folded edges 31 on the plane where the cover body 1 is located may be 100 mm 2 , 200mm 2 、300mm 2 , 400mm 2 , 500mm 2 、600mm 2 、700mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 、1100mm 2 , 1200mm 2 、1300mm 2 、1400mm 2 、1500mm 2Etc. The area of ​​the region enclosed by the orthographic projections of the outer edges 313 of the multiple folded edges 31 on the plane where the cover body 1 is located is too small, and accordingly, the cross-sectional area of ​​the pole 2 perpendicular to its axial direction Z is too small, and the current flow capacity and heat dissipation capacity of the pole 2 are relatively weak; the area of ​​the region enclosed by the orthographic projections of the outer edges 313 of the multiple folded edges 31 on the plane where the cover body 1 is located is too large, and accordingly, the pole 2 will occupy a larger space of the cover body 1, which is not conducive to the design of other structures such as explosion-proof valves and injection holes on the cover assembly. In this exemplary embodiment, the area of ​​the region enclosed by the orthographic projections of the outer edges 313 of the multiple folded edges 31 on the plane where the cover body 1 is located is set to an appropriate size. This setting can not only ensure that the pole has a strong current flow capacity and heat dissipation capacity, but also facilitate the design of other structures of the cover assembly.

[0064] It should be noted that the area enclosed by the orthographic projections of the outer edges 313 of the multiple folded edges 31 on the plane where the cover body 1 is located can be understood as: the orthographic projections of adjacent ends of the outer edges 313 of adjacent folded edges on the plane where the cover body 1 is located are connected by a straight line, and the area enclosed by the straight line and the outer edges 313 of the folded edges is the area enclosed by the orthographic projections of the outer edges 313 of the multiple folded edges 31 on the plane where the cover body 1 is located.

[0065] In this exemplary embodiment, Figure 1-6 As shown, the cover assembly may further include: a limiting portion 4, the limiting portion 4 is fixed to the cover body 1, the limiting portion 4 and the folding edge 31 are spaced apart in a direction Z perpendicular to the cover body 1, and the orthographic projection of the limiting portion 4 on the plane where the cover body 1 is located and the orthographic projection of the folding edge 31 on the plane where the cover body 1 is located at least partially overlap, and at least part of the structure of the pole 2 is fixed between the limiting portion 4 and the folding edge 31. That is, in this exemplary embodiment, part of the structure of the pole 2 can be clamped between the folding edge 31 and the limiting portion 4, thereby achieving the fixation of the pole.

[0066] In this exemplary embodiment, Figure 1-6 As shown, a pole hole 41 is formed on the limiting portion 4, and at least part of the structure of the pole 2 is located in the pole hole 41. On the one hand, the pole hole 41 can limit the pole 2; on the other hand, at least part of the structure of the pole 2 extends into the pole hole 41, so that the pole and the battery cell in the battery housing can be easily connected. In this exemplary embodiment, the pole hole 41 can be a runway shape. It should be understood that in other exemplary embodiments, the pole hole 41 can also be circular, elliptical, polygonal, irregular, etc.

[0067] like Figure 1-6As shown in Figures 1 and 8, the cover assembly is buckled on the main housing 7 of the battery to form a space for accommodating the battery body 5. The ratio of the side area of ​​the pole 2 away from the battery body 5 to the area of ​​the pole hole 41 is 0.8-1.5. For example, the ratio of the side area of ​​the pole 2 away from the battery body 5 to the area of ​​the pole hole 41 can be 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc. The ratio of the side area of ​​the pole 2 away from the battery body 5 to the area of ​​the pole hole 41 is too large, the area of ​​the pole hole 41 is too small, the cross-sectional area of ​​the local structure in the pole located in the pole hole is too small, and the current carrying capacity of the pole is weak; the ratio of the side area of ​​the pole 2 away from the battery body 5 to the area of ​​the pole hole 41 is too small, the area of ​​the side of the pole 2 away from the battery body 5 is too small, and the side of the pole 2 away from the battery body 5 is not easy to be welded with the busbar and other structures. In this exemplary embodiment, the ratio of the side area of ​​the pole 2 facing away from the cell body 5 to the area of ​​the pole hole 41 is set to a suitable size, which can improve the current carrying capacity of the pole 2 and facilitate welding of the pole 2 and the busbar.

[0068] In this exemplary embodiment, the battery cell may include a stacked positive electrode sheet, a negative electrode sheet, and a separator between the positive and negative electrode sheets. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer located on at least one side of the positive electrode collector. The negative electrode sheet may include a negative electrode collector and a negative electrode active material layer located on at least one side of the negative electrode collector. The tabs include a positive tab and a negative tab. The positive tab is connected to the positive electrode collector in the positive electrode sheet. For example, the positive tab can be formed by cutting the positive electrode collector material layer. The negative tab is connected to the negative electrode collector in the negative electrode sheet. For example, the negative tab can be formed by cutting the negative electrode collector material layer. The positive electrode active material of the lithium-ion battery may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode active material may be graphite, silicon, etc. During charging, lithium ions are separated from the positive electrode active material, move to the negative electrode active material through the electrolyte, and the lithium ions are embedded in the interlayer gaps of the carbon material to complete the battery charging process. During discharge, lithium ions are separated from the negative electrode active material and move to the positive electrode active material through the electrolyte, completing the discharge process of the battery.

[0069] In this exemplary embodiment, Figure 1-6As shown, the pole 2 may include: a main body 21 and an annular protrusion 22. The main body 21 includes a first main body 211 and a second main body 212, the first main body 211 and the second main body 212 extend along the axial direction Z of the pole 2, the first main body 211 is located on the side of the pole hole 41 away from the battery body 5, and the second main body 212 is at least partially located in the pole hole 41. The annular protrusion 22 is arranged around the circumference of the main body 21, and the annular protrusion 22 is clamped between the limit portion 4 and the folded edge 31, that is, the pole 2 can be fixed between the limit portion 4 and the folded edge 31 by the annular protrusion 22. Among them, the cross-sectional area of ​​the first main body 211 perpendicular to the axial direction of the pole 2 can be larger than the cross-sectional area of ​​the second main body 212 perpendicular to the axial direction of the pole 2. On the one hand, this arrangement can prevent the area of ​​the pole hole from being too large. If the area of ​​the pole hole is too large, the strength of the cover body will be too low. On the other hand, this arrangement can increase the cross-sectional area of ​​the first main body 211, thereby increasing the current carrying capacity of the pole 2. In addition, this arrangement can also facilitate the welding of the first main body 211 and external structures such as the busbar.

[0070] In this exemplary embodiment, Figure 1-6 As shown, the annular protrusion 22 is disposed around the first main body 211 . It should be understood that in other exemplary embodiments, the annular protrusion 22 may also be disposed around the second main body 212 .

[0071] In this exemplary embodiment, the side area of ​​the pole 2 facing away from the cell body 5 is the side area of ​​the first main body 211 facing away from the second main body 212 .

[0072] In this exemplary embodiment, Figure 1-6 As shown in FIG. 8 , the folded edge 31 may be located on the side of the limiting portion 4 facing away from the battery body 5, that is, the folded edge 31 is folded and riveted to the pole 2 outside the battery shell. It should be understood that in other exemplary embodiments, the folded edge 31 may also be located on the side of the limiting portion 4 facing the battery body 5, that is, the folded edge 31 is folded and riveted to the pole 2 inside the battery shell.

[0073] In this exemplary embodiment, Figure 1-6 As shown, the cover plate assembly may further include: an insulating member 61, the insulating member 61 is arranged on the periphery of the pole 2, at least part of the structure of the insulating member 61 is located between the fixing structure 3 and the limiting portion 4, and the fixing structure 3 and the limiting portion 4 fix the pole 2 through the insulating member 61. The insulating member 61 can insulate the pole 2 from the limiting portion 4 and the fixing structure 3. The insulating member 61 may be a plastic member. It should be understood that in other exemplary embodiments, the insulating member 61 may also be made of materials such as rubber, mica, and ceramics.

[0074] In this exemplary embodiment, Figure 1-6As shown, the insulating member 61 may include: an arc-shaped extension portion 611 and a straight extension portion 612, wherein the arc-shaped extension portion 611 is at least partially located between the fixing structure 3 and the pole 2, and the fixing structure 3 fixes the pole 2 through the insulating member 61; the straight extension portion 612 is located outside the space between the fixing structure 3 and the pole 2, and the straight extension portion 612 is connected between adjacent ends of two adjacent arc-shaped extension portions 611.

[0075] In this exemplary embodiment, Fig. 9 As shown, it is a partial structural schematic diagram of another exemplary embodiment of the cover plate assembly of the present disclosure. The insulating member 61 may also include: a protrusion 613, the protrusion 613 is located outside the space between the fixed structure 3 and the pole 2, and is connected between the straight extension portion 612 and the arc extension portion 611; the fixed structure 3 is limited between the two protrusions 613. This arrangement can prevent the insulating member 61 from rotating along the circumferential direction of the pole 2. It should be noted that the two ends of the fixed structure 3 can directly abut the protrusion 613, and the two ends of the fixed structure 3 can also have a small gap with the protrusion 613.

[0076] In this exemplary embodiment, Figure 1-6 As shown, the folded edge 31 extends around the circumference of the pole 2, the circumference of the pole 2 is perpendicular to the axial direction of the pole, the folded edge 31 includes a thinning area 314 located at at least one end of the extension direction thereof, the thickness of the thinning area 314 is less than the thickness of other areas of the folded edge 31, and the thinning area 314 can be bent toward one side of the cover body 1. The thinning area 314 can give a certain pre-tightening force to the insulating member 61 on the side of the cover body 1, thereby further preventing the insulating member 61 from rotating along the circumference of the pole 2.

[0077] In this exemplary embodiment, Figure 1-6 As shown, the cover plate assembly may further include a seal 62, which is located between the limiting portion 4 and the pole 2. The seal 62 may prevent the electrolyte and other substances inside the battery housing from leaking out.

[0078] In this exemplary embodiment, Figure 1-6 As shown, the annular protrusion 22 includes: two arcuate edges 221 and two straight edges 222. The two arcuate edges 221 are arranged opposite to each other, and the two straight edges 222 are arranged opposite to each other, and the straight edge 222 is connected between the two arcuate edges 221. The arcuate edge 221 can be clamped between the limit portion 4 and the folded edge 31, and the straight edge 222 can be located outside the gap between the limit portion 4 and the folded edge 31. The two arcuate edges 221 can be arranged opposite to each other in the length direction X of the cover body, and the two straight edges 222 can be arranged opposite to each other in the width direction Y of the cover body.

[0079] This exemplary embodiment also provides a method for manufacturing a cover plate assembly, the manufacturing method comprising:

[0080] Provided is a semi-finished cover plate product, the semi-finished cover plate product comprising a cover plate body, a plurality of vertical walls, and a pole, wherein the pole is arranged on the cover plate body, and a plurality of the vertical walls are fixed on the cover plate body and are arranged at intervals around the pole;

[0081] The roller assembly is used to perform circular motion so that the roller of the roller assembly presses and bends the vertical wall toward one side of the pole, and the bent vertical wall forms a folded edge, which is used to fix the pole on the cover plate body.

[0082] In the cover plate assembly manufactured by the manufacturing method, the outer edges 313 of the plurality of folded edges 31 may be located on the circumference of the same circle.

[0083] In this exemplary embodiment, the roller is inclined to contact the vertical wall, and the roller gradually moves toward the central axis of the pole. This arrangement can prevent the roller from getting stuck in the gap between the folded edges, and can also prevent the roller from damaging the folded edge structure when it penetrates into the gap between the folded edges.

[0084] In this exemplary embodiment, using the roller assembly to perform circular motion includes:

[0085] The roller assembly is used to make multiple circular motions, and each time the roller assembly makes one circular motion, the roller moves 0.05mm-0.5mm toward the central axis of the pole. For example, each time the roller assembly makes one circular motion, the roller moves toward the central axis of the pole by 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0086] This exemplary embodiment also provides a method for manufacturing a cover plate assembly, the manufacturing method comprising:

[0087] Provided is a semi-finished cover plate product, the semi-finished cover plate product comprising a cover plate body, a plurality of vertical walls, and a pole, wherein the pole is arranged on the cover plate body, and a plurality of the vertical walls are fixed on the cover plate body and are arranged at intervals around the pole;

[0088] A plurality of roller assemblies are used to bend the vertical walls corresponding to the poles respectively toward one side thereof, the vertical walls and the roller assemblies are arranged in one-to-one correspondence, the bent vertical walls form folded edges, and the folded edges are used to fix the poles on the cover plate body;

[0089] Wherein, using a plurality of roller assemblies to bend the vertical walls corresponding to the poles toward one side thereof respectively comprises:

[0090] The plurality of roller assemblies are used to perform reciprocating motion to bend the vertical wall corresponding to the pole toward one side.

[0091] In the present exemplary embodiment, the roller is in contact with the vertical wall at an angle, and the roller gradually moves toward the central axis of the pole.

[0092] In this exemplary embodiment, a plurality of roller assemblies are used to perform reciprocating motion, including:

[0093] Each time the roller assembly makes a reciprocating motion, the roller moves 0.05mm-0.5mm toward the central axis of the pole. For example, each time the roller assembly makes a circular motion, the roller moves toward the central axis of the pole by 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0094] The present exemplary embodiment also provides a battery, which includes the above-mentioned cap plate assembly.

[0095] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0096] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0097] In other exemplary embodiments, the battery may be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and may be arc transitions.

[0098] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0099] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0100] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.

[0101] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0102] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0103] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0104] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0105] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0106] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly comprises: Cover plate body (1); A pole (2), wherein the pole (2) is arranged on the cover plate body (1); A fixing structure (3) fixed on the cover plate body (1), the fixing structure (3) comprising a plurality of folded edges (31), the plurality of folded edges (31) being arranged at intervals around the same pole (2), the folded edges (31) being used to fix the pole (2); The folded edge (31) includes an outer edge (313) away from the pole (2), the maximum distance between the outer edges (313) of different folded edges is D, the maximum width of the cover plate body (1) is L, and D / L is 0.7-2; The dimension of the pole (2) in the length direction of the cover plate body (1) is greater than the dimension of the pole (2) in the width direction of the cover plate body (1).

2. The cover plate assembly according to claim 1, characterized in that: The outer edges (313) of the plurality of folded edges (31) are located on the circumference of the same circle.

3. The cover plate assembly according to claim 1, characterized in that: Among the plurality of folded edges (31), outer edges (313) of at least some of the folded edges (31) are located on the circumferences of different circles.

4. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The multiple folded edges (31) include a first folded edge (311) and a second folded edge (312), the first folded edge (311) and the second folded edge (312) are arranged relative to each other in the length direction of the cover body (1), and the maximum distance between the outer edge (313) of the first folded edge (311) and the outer edge (313) of the second folded edge (312) is D, wherein D / L is 0.7-1.

7.

5. The cover plate assembly according to claim 4, characterized in that: The first folded edge (311) and the second folded edge (312) are symmetrically arranged parallel to a symmetry axis in a width direction of the cover plate body (1).

6. The cover plate assembly according to claim 4, characterized in that: The outer edge (313) of the first folded edge (311) includes a first end (3131), and the outer edge (313) of the second folded edge (312) includes a second end (3132) close to the first end (3131); The orthographic projection of the central axis of the pole (2) on the plane where the cover body (1) is located forms the vertex of a first angle (α), the orthographic projection of the first end (3131) on the plane where the cover body (1) is located is located on one side of the first angle, and the orthographic projection of the second end (3132) on the plane where the cover body (1) is located is located on the other side of the first angle; The first angle is 60°-150°.

7. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The cover plate assembly also includes: A limiting portion (4) is fixed to the cover body (1), the limiting portion (4) and the folded edge (31) are spaced apart in a direction perpendicular to the cover body (1), and the orthographic projection of the limiting portion (4) on the plane where the cover body (1) is located and the orthographic projection of the folded edge (31) on the plane where the cover body (1) is located at least partially overlap, and at least a part of the structure of the pole (2) is fixed between the limiting portion (4) and the folded edge (31); The pole (2) comprises: A main body (21); An annular protrusion (22), the annular protrusion (22) being arranged around the circumference of the main body (21), and the annular protrusion (22) being clamped between the limiting portion (4) and the folded edge (31).

8. The cover plate assembly according to claim 7, characterized in that: A pole hole (41) is formed on the limiting portion (4), and the cover plate assembly is applied to a battery, wherein the battery comprises a battery cell body (5); The main body (21) comprises a first main body (211) and a second main body (212), the first main body (211) and the second main body (212) extending along the axial direction of the pole (2), the first main body (211) being located on a side of the pole hole (41) away from the battery cell body (5), and the second main body (212) being at least partially located in the pole hole (41); The cross-sectional area of ​​the first main body portion (211) perpendicular to the axial direction of the pole (2) is greater than the cross-sectional area of ​​the second main body portion (212) perpendicular to the axial direction of the pole (2).

9. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The cover plate assembly also includes: A limiting portion (4) is fixed to the cover body (1), the limiting portion (4) and the folded edge (31) are spaced apart in a direction perpendicular to the cover body (1), and the orthographic projection of the limiting portion (4) on the plane where the cover body (1) is located and the orthographic projection of the folded edge (31) on the plane where the cover body (1) is located at least partially overlap, and at least a part of the structure of the pole (2) is fixed between the limiting portion (4) and the folded edge (31); The cover plate assembly is applied to a battery, and the battery comprises a battery cell body (5); The folded edge (31) is located on a side of the limiting portion (4) facing away from the battery cell body (5), or the folded edge (31) is located on a side of the limiting portion (4) facing the battery cell body (5).

10. The cover plate assembly according to claim 7, characterized in that: The annular protrusion (22) comprises: Two arc-shaped edges (221), the two arc-shaped edges (221) are arranged opposite to each other; Two straight edges (222), the two straight edges (222) are arranged opposite to each other, and the straight edges (222) are connected between the two arc-shaped edges (221); The arc-shaped edge (221) is clamped between the limiting portion (4) and the folded edge (31).

11. The cover plate assembly according to any one of claims 1 to 3, characterized in that: The cross section of the pole (2) along a direction perpendicular to its axial direction is in a racetrack shape.

12. A battery, characterized in that: A cover plate assembly comprising any one of claims 1 to 11.

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